Chance Linarez
Heat Exchanger System
About CWU Senior Project
Heat Exchanger for Water Jet Cutting Machine
Function
A device is needed to reduce the water temperature in a water jet machine tank.
Omax 80x Water Jet Cutting Machine
Machine Specifications:
Tank size: about 2000 gallons
High pressure at nozzle: 55 ksi
Low pressure at nozzle: 18 ksi
Abrasive flow rate: 0.663 lb/min
Mixing tube diameter (nozzle size): 0.0300 in
Device: Parts, Shapes, and Conformation
The heat exchanger consists of fins, tubes, and a stand. The shape of the heat exchanger is a tall thin square, about 36 inches wide and 2 inches thick.
Device Assembly and Attachments
The heat exchanger is attached to a stand that has casters on the bottom. The heat exchanger itself is a series of copper tubes that will be soldered together. The fins will be attached together via spacer and rod that sandwiches them together.
Tolerances
The heat exchanger design is designed to provide a heat transfer rate of 20kW from water to air. Due to various temperatures of air in which the heat exchanger operates, the heat transfer rate is acceptable if within a range of 12kW and higher.
Operation Limits
The heat exchanger is not recommended to operate in air temperatures higher then 100°F due to there not being a larger enough temperature difference between the water and air and the rate of heat transfer will be very minimal. Although operation during higher air temperatures does not pose any safety or damage concerns.
The heat exchanger is not recommended to operate in air temperatures lower than 37°F. Operating in temperatures any lower than 37°F may cause ice buildup between fins and/or in water manifold and tubes causing damage to the unit.